ADade Posted January 15, 2023 Share Posted January 15, 2023 I'm bringing back a 1914 B-37 touring car after long term storage and need spark plugs. The plugs that were in the engine were marked "AC C-78L Commercial". Does anybody know of a modern equivalent, or where I might look? This is a nice car - 1960's AACA first place national junior and 2x national first place senior, plus first place national senior VMCCA winner, so I want to do it right. Link to comment Share on other sites More sharing options...
rocketraider Posted January 15, 2023 Share Posted January 15, 2023 Is it possible to clean these plugs and re-use, or are they damaged or no longer fire? Link to comment Share on other sites More sharing options...
Hans1 Posted January 16, 2023 Share Posted January 16, 2023 Help me undwestand your car, a 1914 B-37 touring car is not clear to me. The plug you listed is a lot newer than 1914, it may be a close or correct replacement. If I know your make, model, eng, perhaps there maybe info to help ID the proper plug. However the plug you list has some conversions. AC C 78 L Looks like AC Corolox 78 Long Commercial. A very HOT plug, likely to burn off oil and soot on plug. Thread is 78 with 15/16 hex per my old charts: conversion Champion 3-Com Edison 31-T //// also Champ. 3-Com and 22 and 20 a little hotter is Champ C-4 ///////////////////////// Link to comment Share on other sites More sharing options...
1912Staver Posted January 16, 2023 Share Posted January 16, 2023 1914 B 37 is probably a Model B 37 Buick. Quite a nice car. The B 37 was the larger of Buicks 4 Cyl. cars in 1914, and the touring car body style. There was also a roadster built on the same chassis { B 36 ? } There was also a even bigger Buick for 1914, the B 55 Buick 6 touring. Very rare today. 1 Link to comment Share on other sites More sharing options...
Mark Shaw Posted January 16, 2023 Share Posted January 16, 2023 Champion W89D - Alternative spark plugs (sparkplug-crossreference.com) Link to comment Share on other sites More sharing options...
Larry Schramm Posted January 17, 2023 Share Posted January 17, 2023 On 1/15/2023 at 5:09 PM, ADade said: I'm bringing back a 1914 B-37 touring car after long term storage and need spark plugs. The plugs that were in the engine were marked "AC C-78L Commercial". Does anybody know of a modern equivalent, or where I might look? This is a nice car - 1960's AACA first place national junior and 2x national first place senior, plus first place national senior VMCCA winner, so I want to do it right. Now Alex, why are still asking the question again. The plug to use is the Champion 598 or Champion W89D which are basically the same plug. Talk to the individuals that have driven those cars THOUSANDS of MILES. 6 hours ago, Mark Shaw said: Champion W89D - Alternative spark plugs (sparkplug-crossreference.com) Talk to Brian Heil for a reference if you are not sure. He can tell you his experience with different plugs. 1 Link to comment Share on other sites More sharing options...
dibarlaw Posted January 17, 2023 Share Posted January 17, 2023 Just saying that the screen shot illustration shows a plug with a much longer electrode and insulator extension than the 598 (89W). The "reach" is longer than the 7/8 thread Motorcraft 3076s but less than 1/2 of what the illustration shows. And... like the Other Larry... I have used the Champion 598 for many miles. Below an ad for what would have been original equipment. AC 78LT The 1914 B-37 that we tried to buy. The 1914 B-37 That Marty Roth offered me.. Way to nice for the likes of me.... 2 Link to comment Share on other sites More sharing options...
ADade Posted January 17, 2023 Author Share Posted January 17, 2023 Thanks for the inputs. I have indeed ordered a set of Champion 589 plugs -- Larry, I posted this question then thought "DUH! Larry Schramm has this exact engine -- ask him!" Sometimes I'm a little slow on the uptake. 1 Link to comment Share on other sites More sharing options...
Lahti35 Posted January 17, 2023 Share Posted January 17, 2023 (edited) 13 hours ago, dibarlaw said: Just saying that the screen shot illustration shows a plug with a much longer electrode and insulator extension than the 598 (89W). The "reach" is longer than the 7/8 thread Motorcraft 3076s but less than 1/2 of what the illustration shows. I don't know what plug they show in the pic but you are darn right about the length, those pictured plugs could start a car next to the one they're in! I've got the 589's in my Nash, an upgrade from the pervious owners pugs that were too short, the 589's a great plugs. Edited January 17, 2023 by Lahti35 (see edit history) 2 Link to comment Share on other sites More sharing options...
dibarlaw Posted January 17, 2023 Share Posted January 17, 2023 Lahti35: Thanks for the photos. I did not feel like going over to where I have my 1925 Buick stored and pull a plug to photograph. Note* the Champion 598(89D) has a 15/16" hex. As do the Motorcraft 3076s and 3077s. The earlier AC Titan style plugs had an 1 1/8" hex. On Buick this changed for 1924 when the engine had a detatchable head. Too narrow a space for the old style plugs between the push rod chambers. The original style AC plugs have a 7/8" hex as do the Champion #6 for a period replacement. Period tool kit spark plug wrenches are 7/8" 1924 and after. Link to comment Share on other sites More sharing options...
Hans1 Posted January 18, 2023 Share Posted January 18, 2023 (edited) / / Sorry, my skills in posting pictures is insufficent. The picture of the older origional plugs just will not post properly. Are you are looking for the older style plugs or more recent plugs to just drive. Edited January 18, 2023 by Hans1 (see edit history) Link to comment Share on other sites More sharing options...
Dandy Dave Posted January 18, 2023 Share Posted January 18, 2023 (edited) I just went thu all the parts and instruction books I have and the only thing mentioned is connectors for Champion spark plugs. Not a listing of the original spark plugs used at the time themselves. Dandy Dave! Edited January 18, 2023 by Dandy Dave (see edit history) 1 Link to comment Share on other sites More sharing options...
jp1gt Posted January 18, 2023 Share Posted January 18, 2023 Is there a website that can ID a spark plug by the make and number? I have 2 boxes of old spark plugs that I need to look through Link to comment Share on other sites More sharing options...
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